The autopsy, which included toxicology tests and a brain examination, found that Paddock had anti-anxiety medication in his system. It also confirmed what authorities had previously said — that Paddock died of a self-inflicted gunshot wound to his head after he opened fire at an outdoor concert from his 32nd-floor Mandalay Bay suite, killing 58 people and injuring hundreds more.

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The bullet that killed Paddock entered the roof of his mouth and traveled to the back of his head and then upward without exiting his body, leaving fractured bones along the way, the report says. Paddock also had scrapes on his right upper calf and knee and a bruise on his left calf.

A separate examination of his brain done at Stanford University found no major abnormalities, including no evidence of Alzheimer’s disease.

Amounts of nordiazepam, oxazepam and temazepam, which are consistent with the anti-anxiety drug Valium, were found in his urine, a toxicology report shows. There was no mention in the results of substances associated with alcohol.

“It seems that based on the autopsy reports there were no physical excuses for what Steve did,” said Paddock’s brother Eric, who had to wait nearly four months to get his brother’s cremated body. “We may never understand why Steve did this.”

That’s not entirely true. Many anti-depressants and other psychotropic drugs have been found to be used by a variety of mass shooters since the shooting that occurred at Columbine High School in 1999.